Dunno if this is the right place for this post (other than it being in English!) but I've released SpecEmu v2.8 for PC/Windows, emulating 48/128/+2/+3/TC2048/Pentagon 128K emulation.
The main new additions from the previous release are RZX capability (with rollback recording) and a (slightly rough) implementation of the flashing quirk and 4 brightness levels of the 48K/128K ULAs. I'm told these quirks don't exist on the +2A/+3 ULA but I'm not able to test those myself.
I've put a few rather simple examples of the effects here.
In the emulator there's a "ULA colour ramping" option in the Display options which turns the quirky behaviour on, or it can be toggled on/off using the ALT+C keys. I really need to find a better name for it...
Now what I was wondering was if any of the Pentagon (or other) clones show anything like the same effect with some of those tests programs. Though to be honest, my Pentagon knowledge is lacking to the point that I don't have the slightest clue how closely those ULAs might be based on the original versions so this might well come across as a daft question to everyone